<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button>按钮1</button>
    <button>按钮2</button>
    <button>按钮3</button>
    <button>按钮4</button>
    <button>按钮5</button>
    <button>按钮6</button>
    <button>按钮7</button>
    <button>按钮8</button>
    <button>按钮9</button>
    <button>按钮10</button>

    <script>
      // 使用 for-of 循环遍历所有按钮，为其注册点击事件，每次点击输出其内容即可
    </script>
  </body>
</html>

